diff --git a/Box_intersection_d/test/Box_intersection_d/automated_test.cpp b/Box_intersection_d/test/Box_intersection_d/automated_test.cpp
index 3355aca72fb..689df8f5194 100644
--- a/Box_intersection_d/test/Box_intersection_d/automated_test.cpp
+++ b/Box_intersection_d/test/Box_intersection_d/automated_test.cpp
@@ -95,8 +95,8 @@ operator()( const char* filename1, const char* filename2 )
     std::cout << "segment tree ...... " << std::flush;
     timer.reset();
     timer.start();
-    const unsigned int n = boxes1.size();
-    const unsigned int cutoff = n < 2000 ? 6 : n / 100;
+    const std::size_t n = boxes1.size();
+    const std::size_t cutoff = n < 2000 ? 6 : n / 100;
     CGAL::box_intersection_custom_predicates_d( boxes1.begin(), boxes1.end(),
                                                 boxes2.begin(), boxes2.end(),
                                                 callback3, 
diff --git a/Box_intersection_d/test/Box_intersection_d/benchmark.cpp b/Box_intersection_d/test/Box_intersection_d/benchmark.cpp
index 85190c71d9c..119e18c4216 100644
--- a/Box_intersection_d/test/Box_intersection_d/benchmark.cpp
+++ b/Box_intersection_d/test/Box_intersection_d/benchmark.cpp
@@ -51,7 +51,7 @@ test_n( unsigned int n, std::ostream& outfile )
     typename Uti1::Counter_callback callback1, callback2;
     CGAL::Timer timer, timer_scan;
     double time, time_scan;
-    unsigned int problemsize = boxes1.size() + boxes2.size();
+    std::size_t problemsize = boxes1.size() + boxes2.size();
     unsigned int cutoff = 0;
     unsigned int stepsize = 500;
     double last_time = 1e30;